Adjust repo namespace for pbr

This is a follow up for change Ifcfce490edb3d77e4e436e002d35bc909e1a057c
where the GIT_BASE was changed to the opendev URL to avoid redirects.
The pbr namespace in stackrc was old and still getting redirected and
this change fixes that.

Change-Id: Ib444e928fa2ca7650670f97be6927202333a1dd7
diff --git a/stackrc b/stackrc
index 4fc31a3..2661b5f 100644
--- a/stackrc
+++ b/stackrc
@@ -498,7 +498,7 @@
 GITBRANCH["tooz"]=${TOOZ_BRANCH:-$TARGET_BRANCH}
 
 # pbr drives the setuptools configs
-GITREPO["pbr"]=${PBR_REPO:-${GIT_BASE}/openstack-dev/pbr.git}
+GITREPO["pbr"]=${PBR_REPO:-${GIT_BASE}/openstack/pbr.git}
 GITBRANCH["pbr"]=${PBR_BRANCH:-$TARGET_BRANCH}